public void addHeaderFooter(Document doc){
		//创建页脚 页码
		HeaderFooter footer = new HeaderFooter(doc, HeaderFooterType.FOOTER_PRIMARY);
		doc.getFirstSection().getHeadersFooters().add(footer);

		//页脚段落
		Paragraph footerpara = new Paragraph(doc);
		footerpara.getParagraphFormat().setAlignment(ParagraphAlignment.CENTER);
		Run footerparaRun = new Run(doc);
		footerparaRun.getFont().setName("宋体");
		footerparaRun.getFont().setSize(9.0);//小5号字体
		footerpara.appendChild(footerparaRun);
		try {
			footerpara.appendField(FieldType.FIELD_PAGE, true);//当前页码
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
		footerpara.appendChild(footerparaRun);
		footer.appendChild(footerpara);

	}